Femoroacetabular impingement (FAI) is a condition where the femoral head-neck junction collides with the acetabulum. Open or arthroscopic treatment of FAI aims to increase hip motion while reducing impingement during passive or dynamic movements. What are the biomechanical characteristics of the hip and pelvis in adolescents and young adults diagnosed with FAI syndrome 1) pre-operatively compared to controls and 2) pre- to post-operatively? 43 patients with FAI and 43 controls were included in the study. All patients with FAI had cam deformities and underwent unilateral hip preservation surgery (either open or arthroscopic). Pre- and post-operative imaging, patient-reported outcomes, and gait analysis were performed. Joint angles and internal joint moments were evaluated with an emphasis on the pelvis and hip. A comparative analysis was conducted to evaluate the gait patterns before and after surgical treatment, as well as to compare pre-operative gait patterns to a control group. 43 patients with FAI (28 female, 16.5 ± 1.5 yrs) and 43 controls (28 female, 16.0 ± 1.5 yrs) were included. Pre-operative patients with FAI had decreased stride length and walking speed compared to controls, with no significant change following surgery. There were no differences in sagittal and coronal plane hip and pelvis kinematics comparing pre- to post-operative and pre-operative to controls. Pre-operatively, differences in internal hip rotation angle (pre: 3.3˚, post: 3.9˚, controls: 7.7˚) and hip extensor moment (pre: 0.121, post: 0.090, controls: 0.334 Nm/kg) were observed compared to controls with no significant changes observed following surgery. Compensatory movement strategies in pelvic and hip motion are evident during gait in patients with FAI, particularly in the sagittal and transverse planes. These strategies remained consistent two years post-surgery. While surgery improved radiographic measures and patient-reported outcomes, gait did not elicit biomechanical changes following surgical treatment.

中文翻译：

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股骨髋臼撞击青少年患者手术后步态运动学和动力学不会改变

股骨髋臼撞击（FAI）是股骨头颈交界处与髋臼碰撞的情况。FAI 的开放式或关节镜治疗旨在增加髋关节运动，同时减少被动或动态运动期间的撞击。诊断为 FAI 综合征的青少年和年轻人的髋部和骨盆的生物力学特征是什么（1）术前与对照组相比以及 2）术前与术后？该研究包括 43 名 FAI 患者和 43 名对照者。所有 FAI 患者均存在凸轮畸形，并接受单侧髋关节保留手术（开放手术或关节镜手术）。进行术前和术后成像、患者报告的结果和步态分析。评估关节角度和内部关节力矩，重点关注骨盆和臀部。进行比较分析以评估手术治疗前后的步态模式，并将术前步态模式与对照组进行比较。纳入 43 名 FAI 患者（28 名女性，16.5 ± 1.5 岁）和 43 名对照者（28 名女性，16.0 ± 1.5 岁）。与对照组相比，术前患有 FAI 的患者步幅和步行速度有所下降，但术后没有显着变化。术前与术后以及术前与对照相比，矢状面和冠状面髋部和骨盆运动学没有差异。术前观察到髋关节内旋角度（术前：3.3°，术后：3.9°，对照：7.7°）和髋部伸肌力矩（术前：0.121，术后：0.090，对照：0.334 Nm/kg）与术前相比的差异。手术后未观察到显着变化的对照。FAI 患者的步态中骨盆和髋部运动的代偿性运动策略很明显，特别是在矢状面和横切面上。这些策略在手术后两年保持一致。虽然手术改善了放射学测量和患者报告的结果，但手术治疗后步态并未引起生物力学变化。